@article{GDZPPN002435438,
title = {Unique Normal Forms for Planar Vector Fields.},
journal = {Mathematische Zeitschrift},
volume = {199},
year = {1988},
pages = {303-310},
zbl = {0691.58012},
url = {http://dml.mathdoc.fr/item/GDZPPN002435438}
}
Baider, Alberto; Churchill, Richard. Unique Normal Forms for Planar Vector Fields.. Mathematische Zeitschrift, Tome 199 (1988) pp. 303-310. http://gdmltest.u-ga.fr/item/GDZPPN002435438/